Diatomaceous earth - Wikipedia
Diatomaceous earth (/ ˌ d aɪ. ə t ə ˈ m eɪ ʃ ə s /), diatomite (/ d aɪ ˈ æ t ə ˌ m aɪ t /), or kieselgur/kieselguhr is a naturally occurring, soft, siliceous sedimentary rock that can be crumbled into a fine white to off-white powder. It has a particle size ranging from more than 3 μm to less than 1 mm, but typically 10 to 200 μm.Depending on the granularity, this powder can ...